Measuring the Hubble constant
Measuring the Hubble constant from reverberating accretion discs in active galaxies
... 0.25 25 13830 11090 0.86 403.7 1.34 Note: For all fits the number of degrees of freedom is 302. a decrease in the tem peratures, T b and Tp. Table 4.1, adopts a simplified approach, and details the ‘best-fit’ four param ...
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MEASUREMENTS OF THE HUBBLE CONSTANT
... the Hubble constant can then be derived from these ...for measuring the Hubble constant by the HST Key Project in order to derive the most accurate value for H 0 ...
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Measuring the Value of the Hubble Constant “à la Refsdal”
... the Hubble constant that are complementary to and potentially competitive with those of other cosmological ...to Hubble Space Telescope (HST ) deep imaging and Multi Unit Spectroscopic Explorer ...
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Effects of Time Dilation on the Measurements of the Hubble Constant
... when measuring the Hubble constant by starting the evalua- tion from the time of the big bang era, the effect of time dilation results in a decrease in the value of the Hubble ...the ...
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Investigating the prospects for constraining the Hubble constant using compact binary coalescences as standard sirens
... the Hubble constant with the binary neutron star merger GW170817, and in anticipation of future detections during upcoming observing runs, it is useful to further investigate standard sirens, the ...
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Discrepancies in the Measurement of Hubble Constant
... the Hubble constant, we require the recessional velocity of the source ...By measuring the time delay between the ar- rival of the signals in the two detectors and detector response, the network of ...
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Carnegie Hubble Program: A Mid-Infrared Calibration of the Hubble Constant
... the Hubble constant can be measured ...for measuring relative distances beyond the immediate reach of Cepheid ...the Hubble constant at a level of a factor of ...
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A 2.4% DETERMINATION of the LOCAL VALUE of the HUBBLE CONSTANT
... utilizes Hubble Space Telescope ( HST ) observations of Cepheids in the hosts of recent, nearby SNe Ia to link geometric distance measurements to other SNe Ia in the expanding ...for measuring Cepheids, ...
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A New Model of the Gravitational Lens 0957+561 and a Limit on the Hubble Constant
... the Hubble constant? We believe 0957+561 will deliver a result ...above. Measuring σ and thereby obtaining a more reliable estimate of κ is more challenging, but efforts are under way and once again ...
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Precise cosmological analysis of Type Ia supernovae: the Hubble constant and dark energy
... decomposing the variance of each covariance matrix for the parameter Ω m , chosen because it is a pa- rameter of interest that can be constrained by only supernovae, unlike w. Table 6.4 shows the individual contributions ...
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Precise measurements of time delays in gravitationally lensed quasars for competitive and independent determination of the Hubble constant
... into measuring only the Hubble constant, when CMB observations are able to deliver such stringent joint constraints on the whole cosmological parameters ? The answer resides in the question ...
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A NEW CEPHEID DISTANCE TO THE MASER-HOST GALAXY NGC 4258 AND ITS IMPLICATIONS FOR THE HUBBLE CONSTANT 1
... images (Saha et al. 1996) and some based on a more mathe- matical approach ( Leonard et al. 2003). In the case of these observations of NGC 4258, which is lo- cated significantly closer than most Cepheid-bearing galaxies ...
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A HUBBLE DIAGRAM for QUASARS
... remain constant at all redshifts. Based on this result, we built a Hubble diagram for quasars which extends up to z > , and 6 is in perfect agreement with the analogous Hubble diagram for supernovae ...
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COSMOLOGY: HUBBLE CONSTANT AND NEUTRINOS
... Interactions are of cosmological significance when the ratio /H between the interaction and Hubble expansion rates is of order unity or larger. The expansion rate scales as H ⇠ T 2 – 3 – Collisional processes can ...
Calculation of the Universal Gravitational Constant, of the Hubble Constant, and of the Average CMB Temperature
... by Hubble is incom- patible with the “constancy” of c imposed in ...is constant, that is to say, that the units of distance measure enlarge and that the objects shrink over ...really constant, it is ...
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A Possible Solution to the Disagreement about the Hubble Constant
... Although the above absence of correlations supports the model, as well as the proposed resolution of the disagreement over the Hubble constant, neither fully confirms it. On the other hand, the following ...
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Density of Vacuum Like Plasma and Hubble Constant
... Abstract The model in which expansion of the Universe leads to a generation of non-equilibrium vacuum-like electron-positron plasma is proposed and re- searched. The formulas that relate the Hubble’s constant with ...
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Cosmological models, observational data and tension in Hubble constant
... In the next section, we shall demonstrate that the analysis of only Hubble parameter data and the function χ 2 H is not reliable enough for these cosmological models. We have to include into consideration the Type ...
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A Gravitational-Wave Standard Siren Measurement of the Hubble Constant
... THE HUBBLE VELOCITY OF NGC 4993 In previous EM determinations of the cosmic “distance ladder”, the Hubble flow velocity of the local calibrating galaxies has generally been estimated using ...
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A gravitational-wave standard siren measurement of the Hubble constant
... Although the above analysis is conceptually straightforward, it makes several assumptions. In practice, the Hubble flow velocity cannot be determined exactly and must be corrected for uncertain peculiar ...
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